Integrated circuit device, and method of fabricating same

ABSTRACT

There are many inventions described and illustrated herein. In a first aspect, the present invention is directed to integrated circuit device including SOI logic transistors and SOI memory transistors, and method for fabricating such a device. In one embodiment, integrated circuit device includes memory portion having, for example, PD or FD SOI memory cells, and logic portion having, for example, high performance transistors, such as Fin-FET, multiple gate transistors, and/or non-high performance transistors (such as single gate transistors that do not possess the performance characteristics of the high performance transistors). In another aspect, the present invention is directed to a method of manufacture of such integrated circuit device.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of application Ser. No.10/884,481 (still pending), filed Jul. 2, 2004. This application and the'481 application claim priority to U.S. Provisional Application Ser. No.60/489,266, entitled “Integrated Circuit Device, and Method ofFabricating Same”, filed Jul. 22, 2003 (hereinafter “the ProvisionalApplication”). The contents of the Provisional Application areincorporated by reference herein in their entirety.

BACKGROUND

This invention relates to a semiconductor devices, for example, highperformance transistors, and architectures, and techniques forfabricating such devices and architectures; and more particularly, inone aspect, to a semiconductor device including a memory section (forexample, transistors are dynamic random access memory cells (“DRAM”)wherein such cells have an electrically floating body in which anelectrical charge is stored) and a logic section (including, forexample, high performance transistors and non-high performancetransistors) fabricated and/or disposed on the same substrate (forexample, the same semiconductor die).

There is a continuing trend to fabricate advanced integrated circuitsusing techniques, materials and devices that improve performance, reduceleakage current and enhance overall scaling. Silicon-on-Insulator (SOI)is a material in which such devices may be fabricated on or in(hereinafter collectively “on”). Such devices are known as SOI devicesand include, for example, partially depleted (PD), fully depleted (FD)devices, multiple gate devices (for example, double or triple gate),fin-shaped field effect transistor (“Fin-FET”), or gate all arounddevices. SOI devices have demonstrated improved performance (forexample, speed), reduced leakage current characteristics andconsiderable enhancement in scaling.

With reference to FIGS. 1A-1C, three dimensional and cross-sectionalviews of Fin-FET or multiple gate SOI transistor 10 tend to appear quitesimilar. Moreover, the fabrication and configuration of multiple gateSOI transistor 10 typically involves first defining (using conventionallithographic and etching techniques) an upper or top layer of silicon ofSOI wafer 12 (typically having a thickness of 10 to 200 nm) to definesegments or pieces 14 that constitute the active regions of transistor10 (i.e., source 16, drain 18, and body 20). Thereafter, dielectricmaterial is deposited or formed (for example, via oxidation) on siliconsegments 12 to form gate dielectric 22. A gate material (for example, ahighly conductive silicon-based material) is then deposited andpatterned to form gate 24 of transistor 10 which, as illustrated in FIG.1A, is disposed on, juxtaposed and/or “covers” a plurality of interfaces(in the illustrative embodiment, three) of silicon segments or pieces 14of SOI transistor 10.

Notably, the cross sectional view of FIG. 1B is taken through the gateregion and along the longitudinal axis of the gate region of FIG. 1A(along lines B-B′) and, as such, the source and drain regions are notillustrated because they are in a direction perpendicular to that axis.Moreover, the cross-sectional view of FIG. 1C is taken through thesource and drain regions and perpendicular to the longitudinal axis ofthe gate (along lines C-C′).

An advantage of such structures is performance (for example, speed)because, in operation, a channel forms in the body adjacent or beneatheach of the gate-body interfaces. In the illustrative embodiment of FIG.1A, three channels may form: two channels may be vertical and onechannel may be horizontal. As such, the overall current drive of SOItransistor 10 is higher thereby facilitating higher performance orspeed.

Another aspect of such transistors is that certain characteristics ofthe transistor may be determined by selecting the width of the siliconsegments or pieces 14. In this regard, the width of the silicon segmentsor pieces 14 may be selected or designed so that during operation thefull body of transistor 10 is fully depleted or controlled completely bythe voltage applied to gate 24.

Such transistors may be well suited for microprocessors,microcontrollers or the like (hereinafter collectively“microprocessors”). In the context of microprocessors, currently lessthan half of the die of a microprocessor is occupied by or containsadvanced logic transistors. Memory cells (and peripheral circuitry)reside on the remaining area of the die.

With reference to FIGS. 2A-2C, memory cell 26 proposed for SOI materialsmay be based on, among other things, a floating body effect of SOItransistors. (See, for example, U.S. patent application Ser. No.10/450,238, Fazan et al., filed Jun. 10, 2003 and entitled“Semiconductor Device” (hereinafter “Semiconductor Memory Device PatentApplication”; the contents of which are incorporated by referenceherein). In this regard, memory cell 26 may consist of a PD or a FD SOItransistor 28 having a channel (between source region 30 and drainregion 32), which is disposed adjacent to body region 34 and separatedtherefrom by gate dielectric. The body region 34 is electricallyfloating. A gate 36 is employed (in conjunction with source region 30and drain region 32, among other things) to control the operation ofmemory cell 26.

With reference to FIGS. 3A, 3B, 4A and 4B, in one embodiment, data iswritten into or read from a selected memory cell 26 by applying suitablecontrol signals to a selected word line(s) 40, a selected source line(s)42 and/or a selected bit line(s) 44. In response, majority chargecarriers 46 are accumulated in or emitted and/or ejected fromelectrically floating body region 34 wherein the data states are definedby the amount of carriers within electrically floating body region 34.In one embodiment, memory cell 26 operates by accumulating in oremitting/ejecting majority carriers (electrons or holes) 46 from bodyregion 34 of, for example, N-channel transistors. (See, FIGS. 4A and4B). In this regard, accumulating majority carriers (in this example,“holes”) 46 in body region 34 of transistors 28 via, for example, impactionization near source region 30 and/or drain region 32, isrepresentative of a logic high or “1” data state. (See, FIG. 4A).Emitting or ejecting majority carriers 46 from body region 34 via, forexample, forward biasing the source/body junction and/or the drain/bodyjunction, is representative of a logic low data state (“0”). (See, FIG.4B).

Such memory cells, in addition to having low leakage currentcharacteristics, facilitate implementing high-density memory cellarrays. While it may be advantageous to integrate SOI logic transistorsand SOI memory cells on a single die to, among other things, reduce theoverall dimensions of the die, fabricating an integrated device havingSOI logic transistors and SOI memory cells may be challenging becauseeach have unique and/or differing fabrication considerations. There is aneed for a method of fabricating an integrated circuit device comprisedof high performance SOI transistors (for example, Fin-FET and multiplegate structures) and SOI memory cells (for example, PD or FD SOI memorycells). Indeed, there is a need for a high performance integratedcircuit device having SOI logic (including high performance and/ornon-high performance transistors) and SOI memory that each includeimproved performance (for example, speed), reduced leakage currentcharacteristics and/or considerable enhancement in scaling and density.

SUMMARY OF THE INVENTION

There are many inventions described and illustrated herein, includingaspects and embodiments thereof. In a first principal aspect, thepresent invention is an integrated circuit device disposed in or on asemiconductor layer which resides on or above an insulating layer of asubstrate, the semiconductor integrated circuit device comprises amemory section and a logic section. The memory section includes aplurality of memory cells wherein each memory cell includes a transistorhaving a source region, a drain region and a body region disposedbetween the source region and the drain region, wherein the body regionis electrically floating. A gate is spaced apart from, and capacitivelycoupled to the body region.

Each memory cell includes a first data state and a second data state.The first data state is representative of a first charge in the bodyregion wherein the first charge is substantially provided byaccumulating majority carriers in the body region. The second data staterepresentative of a second charge in the body region wherein the secondcharge is substantially provided by removing majority carriers from thebody region.

The logic section including a plurality of transistors wherein eachtransistor includes a source region, a drain region and a body regiondisposed between the source region and the drain region, wherein thesource, drain and body regions are disposed in a segment of thesemiconductor layer such that the body region includes a plurality ofsurfaces. A gate is spaced apart from and opposing the plurality ofsurfaces of the body region.

In one embodiment, the source, drain and body regions of a plurality oftransistors of the logic section are contained in a segment of thesemiconductor layer. Further, the plurality of source, drain and bodyregions of the plurality of transistors of the logic section may becontained in a plurality of segments of the semiconductor layer. Indeed,each segment of the plurality of segments contains source, drain andbody regions of a plurality of transistors of the logic section.

In another embodiment, the source, drain and body regions of thetransistors of the memory cells are disposed in a segment of thesemiconductor layer. In this embodiment, the body region of eachtransistor of each memory cell includes a plurality of surfaces andwherein the associated gate is spaced apart from and opposing theplurality of surfaces of the body region.

Notably, in one embodiment, the width of the gate of each transistor ofthe plurality of transistors of the logic section is less than the widthof the gate of each transistor of each memory cell of the memorysection.

In another aspect, the present invention is a method of manufacturing anintegrated circuit device on an SOI wafer having a semiconductor layerdisposed on an insulating layer. The integrated circuit device includes(1) a logic section, including a plurality of transistors, and (2) amemory section, including a plurality of memory cells wherein eachmemory cell consists essentially of one transistor.

The method of this aspect of the invention comprises forming a pluralityof semiconductor pieces in the semiconductor layer of the SOI waferassociated with the logic section, wherein each piece includes aplurality of surfaces. The method also includes forming a memory sectionin the semiconductor layer of the SOI wafer. In this regard, the memorysection includes a major surface.

A dielectric material may be deposited on (i) the plurality of surfacesof the semiconductor pieces and (ii) the major surface of the memorysection. A conductive material may be deposited above the dielectricmaterial and a plurality of gates and associated gate dielectrics may beformed from the conductive material and dielectric material. The methodfurther includes providing source and drain regions in (i) thesemiconductor pieces and (ii) the major surface of the memory section.

In one embodiment, the source and drain regions of the transistors inthe memory section are formed in the major surface of the memory sectionvia ion implantation. The source and drain regions of the transistors inthe logic section may also be formed in the semiconductor pieces via ionimplantation.

In another embodiment, the width of the gates of each transistor of theplurality of transistors of the logic section is less than the width ofthe gate of each transistor of each memory cell of the memory section.

In another aspect, the present invention is a method of manufacturing anintegrated circuit device on an SOI wafer having a semiconductor layerdisposed on an insulating layer. The integrated circuit device includes(1) a logic section, including a plurality of transistors, and (2) amemory section, including a plurality of memory cells wherein eachmemory cell consists essentially of one transistor. The method of thisaspect of the present invention includes forming a plurality ofsemiconductor pieces in the semiconductor layer of the SOI waferassociated with the logic section and the memory section, wherein eachsemiconductor piece includes a plurality of surfaces.

The method further includes depositing a dielectric material on theplurality of surfaces of the semiconductor pieces of the SOI waferassociated with the memory and logic sections. A conductive material maybe deposited above the dielectric material, and a plurality of gates andassociated gate dielectrics may be formed from the conductive materialand the dielectric material. The source and drain regions may be formedin the semiconductor pieces of the SOI wafer associated with the memoryand logic sections.

In one embodiment, the source and drain regions of the transistors inthe memory section are formed in the semiconductor pieces of the SOIwafer associated with the memory section via ion implantation. Thesource and drain regions of the transistors in the logic section mayalso be formed in the semiconductor pieces of the SOI wafer associatedwith the logic section via ion implantation.

In another embodiment, the width of the gates of each transistor of theplurality of transistors of the logic section is less than the width ofthe gate of each transistor of each memory cell of the memory section.

Again, there are many inventions described and illustrated herein. ThisSummary of the Invention is not exhaustive of the scope of the presentinvention. Moreover, this Summary is not intended to be limiting of theinvention and should not be interpreted in that manner. While certainembodiments, features, attributes and advantages of the inventions havebeen described in this Summary, it should be understood that manyothers, as well as different and/or similar embodiments, features,attributes and/or advantages of the present inventions, which areapparent from the description, illustrations and claims, which follow.

BRIEF DESCRIPTION OF THE DRAWINGS

In the course of the detailed description to follow, reference will bemade to the attached drawings. These drawings show different aspects ofthe present invention and, where appropriate, reference numeralsillustrating like structures, components, materials and/or elements indifferent figures are labeled similarly. It is understood that variouscombinations of the structures, components, materials and/or elements,other than those specifically shown, are contemplated and are within thescope of the present invention.

FIG. 1A illustrates a three dimensional view of Fin-FET or multiple gateSOI transistor;

FIGS. 1B and 1C illustrate cross-sectional views of a semiconductortransistor as illustrated in FIG. 1A, sectioned along lines B-B′ andC-C′, respectively;

FIG. 2A illustrates a three dimensional view of one embodiment of asemiconductor transistor as illustrated (and described) in theSemiconductor Memory Device Patent Application;

FIGS. 2B and 2C illustrate cross-sectional views of a semiconductortransistor as illustrated in FIG. 2A, sectioned along lines B-B′ andC-C′, respectively;

FIG. 3A is a schematic representation of a portion of a DRAM array asillustrated (and described) in one embodiment of the SemiconductorMemory Device Patent Application;

FIG. 3B illustrates a memory cell according to one embodiment of theSemiconductor Memory Device Patent Application;

FIGS. 4A and 4B are exemplary schematic illustrations of the chargerelationship, for a particular memory state, of the floating body,source and drain regions of a memory cell according to one embodiment ofthe Semiconductor Memory Device Patent Application;

FIGS. 5A and 5B illustrate an integrated circuit device including amemory section having, for example, PD or FD SOI memory cells, and alogic section having, for example, high performance transistors, such asFin-FET, multiple gate transistors, and/or non-high performancetransistors, according to certain embodiments of certain aspects of thepresent inventions;

FIGS. 6-10 and 11A illustrate cross-sectional views of the fabricationof the integrated circuit of FIG. 5A at various stages of an exemplaryprocess, according to certain aspects of the present invention;

FIG. 11B illustrates cross-sectional view of the fabrication of theintegrated circuit of FIG. 5B at a stage of an exemplary process,according to certain aspects of the present invention;

FIG. 12 illustrates an integrated circuit device including a memorysection having, for example, PD or FD SOI memory cells, and a logicsection having, for example, high performance transistors, such asFin-FET, multiple gate transistors, and/or non-high performancetransistors, according to certain embodiments of another aspect of thepresent invention;

FIGS. 13-16 illustrate cross-sectional views of the fabrication of theintegrated circuit of FIG. 12 at various stages of an exemplary process,according to certain aspects of the present invention; and

FIGS. 17A-17C illustrate an integrated circuit device including a memorysection having, for example, PD or FD SOI memory cells, and a logicsection having, for example, high and/or non-high performancetransistors, according to other embodiments of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

There are many inventions described and illustrated herein as well asmany aspects and embodiments of those inventions. In a first aspect, thepresent invention is directed to integrated circuit device including SOIlogic transistors and SOI memory transistors, and method for fabricatingsuch a device. With reference to FIG. 5, in one embodiment, integratedcircuit device 100 includes memory section 102 having, for example, PDor FD SOI memory cells 104 a-d, and logic section 106 having, forexample, high performance transistors 108 a-c, such as Fin-FET, multiplegate transistors, and/or non-high performance transistors (for example,single gate transistors that do not possess the performancecharacteristics of high performance transistors—not illustrated).

With reference to FIG. 6, an exemplary method of fabricating ormanufacturing an integrated circuit 100 according to one aspect of thepresent invention may begin with SOI wafer 110 including substrate 112(comprised of, for example, a semiconductor material (for example,silicon) or a glass-like or insulator-like material) and insulator 114(comprised of, for example, silicon oxide or silicon nitride, orcombinations thereof) disposed thereon. In addition, the SOI waferincludes semiconductor layer 116 (comprised of, for example, silicon orgermanium, or combinations thereof) disposed on insulator 114. Notably,memory and logic sections 102 and 106, respectively, of integratedcircuit device 100 may be formed in or on semiconductor layer 116.

With reference to FIGS. 7 and 8, semiconductor layer 116 may bepatterned (using conventional lithographic and etching techniques) togenerally define memory section 102 and logic section 106. In thisregard, semiconductor layer 116 is patterned to provide semiconductorsegments 118 a that will be employed as the active areas of thetransistors (for example, the source, drain and body of the transistors)of logic section 106 (see, FIG. 7). In addition, in this embodiment,semiconductor section 118 b remains generally unpatterned. Thereafter,dielectric layer 120 (for example, silicon oxide, silicon nitride orcombinations thereof, such as an oxide-nitride-oxide material) may bedeposited, formed and/or grown on semiconductor segments 118 a andsemiconductor section 118 b (see, FIG. 8).

Notably, in one embodiment, the deposition, formation and/or growth ofthe dielectric material is selective. In another embodiment, a layer ofdielectric is deposited, formed and/or grown in a non-selective mannerand that layer is later patterned using conventional lithographic andetching techniques.

With reference to FIGS. 9 and 10, highly conductive layer 122 (comprisedof, for example, heavily doped silicon, germanium, gallium arsenide,metal or metal compound) may then be deposited on dielectric layer 120(see, FIG. 9). The highly conductive layer 122 may then be patterned toform gates 124 of transistors 108 a-c and memory cells 104 a-d (see,FIG. 10) and transistors 108 a-b and/or memory cells 104 a-d (see, forexample, FIGS. 11A and 11B).

Notably, dielectric material 120 disposed on semiconductor segment 118 bmay be patterned before and/or after deposition, formation and/orpatterning of highly conductive layer 122.

Thereafter, in one embodiment, the source regions 126 and drain regions128 of memory cells 104 and transistors 108 may be formed usingconventional techniques (for example, via ion implantation) using theassociated gate as a mask (see, FIGS. 11A and 11B). In anotherembodiment, source and drain implants may be performed before depositionand formation of gates 124. Indeed, the source and/or drain regions 126and 128 (respectively) may be performed at other (earlier and/or later)steps in the fabrication process flow.

Notably, gates 124 of the transistors of memory cells 104 and gates 124of transistors 108 may be interconnected in various ways in order toprovide a predetermined circuit configuration, function or operation.For example, in one embodiment, selected or predetermined gates 124 oftransistors 108 may be connected to provide a particular circuit,function or operation. (See, FIG. 11A).

The fabrication process of integrated circuit device 100 may continuewith the backend processing, including, for example, transistorinterconnection, contact formation, passivating material deposition, andpackaging (if any).

In another embodiment of the present invention, integrated circuitdevice 100 includes memory section 102 including memory cells 104 havingtransistor dimensions that provide, maximize and/or enhance the “memoryeffect”. In this regard, logic section 106 may include high performancetransistors 108 having dimensions that minimize, reduce and/or eliminate“memory effect” to increase the speed and/or predictability of thetransistors in logic section 106. In contrast, memory cells 104 mayinclude transistor dimensions that provide, maximize and/or increase the“memory effect” to, for example, provide suitable and/or enhance thedata retention characteristics of the transistors of memory cells 104.

In one embodiment, changes in the “memory effect” may be implementedusing greater different impurity doping levels of silicon segments orpieces in or near the body region of (i) the transistor of memory cells104 and (ii) transistors 108 of logic section 106. In this regard, asdescribed and illustrated in application Ser. No. 10/487,157, which wasfiled by Fazan et al. on Feb. 18, 2004 and entitled “SemiconductorDevice” (hereinafter the “Semiconductor Memory Device Patent ApplicationII”), the impurity doping levels of the silicon segments or pieces in ornear the body region of the transistor of memory cells 104 may begreater than the impurity doping levels of the silicon segments orpieces in or near the body region of transistors 108 of logic section106. Notably, the entire contents of the Semiconductor Device PatentApplication II, including, for example, the inventions, features,attributes, architectures, configurations, materials, techniques andadvantages described and illustrated therein, are hereby incorporated byreference herein.

In another embodiment, an additional buried impurity region may beincorporated within memory section 102 and/or memory cells 104 as, forexample, described and illustrated in the Semiconductor Device PatentApplication II. Again, those discussions are incorporated by referenceherein in their entirety.

In yet another embodiment, differing characteristics may be obtained byemploying different widths of the silicon segment of memory cells 104and transistors 108. In this way, the transistors of memory cells 104(i.e., the FinFET or multi gate transistors in memory section 102) maybehave more like typical PD or FD transistors. (See, for example, FIG.12). Notably, all techniques to increase, enhance and/or maximize the“memory effect” of the transistors of memory section 102 (relative totransistors 108 of logic section 106), whether now known or laterdeveloped, are intended to come within the scope of the presentinvention.

An exemplary method of fabricating or manufacturing an integratedcircuit according to the embodiment illustrated in FIG. 12 may beginwith an SOI wafer. (See, for example, FIG. 6). Thereafter, semiconductorlayer 116 may be patterned (using conventional lithographic and etchingtechniques), to provide memory section 102, including semiconductorsegments or pieces 118 b, that will be employed as the active areas (forexample, the source, drain and body of the transistors) of thetransistors of memory cells 104 (see, FIG. 13). The logic section 106includes semiconductor segments 118 a having width that is less than thechannel width of the transistors of memory cells 104 (for example, lessthan the width of semiconductor segments 118 b which are patterned andetched in memory section 102 of integrated circuit device 100). Adielectric layer (comprised of, for example, silicon oxide, siliconnitride or combinations thereof, such as an oxide-nitride-oxide) maythen be deposited, formed and/or grown on semiconductor segments 118(see, FIG. 14).

Notably, all of the embodiments, features, attributes and advantages ofthe inventions described and illustrated with respect to FIGS. 5A and 5Bmay be implemented in the embodiment of FIG. 12. For the sake ofbrevity, those discussions will not be repeated in detail.

After deposition of the dielectric layer, a highly conductive material(for example, a layer of heavily doped silicon, germanium, galliumarsenide, metal or metal compound, or combinations thereof) may bedeposited and/or formed on the dielectric material (see, FIG. 15). Thehighly conductive material may be patterned to provide gates 124 of thetransistors of memory cells 104 as well as gates 124 of transistors 108(see, for example, FIG. 12).

As described above with respect to the embodiments of FIGS. 5A and 5B,in one embodiment, the source regions and drain regions are formed viaion implantation using the gate of the transistors as a mask (see, forexample, FIG. 16). In another embodiment, source and drain regions areperformed before deposition and formation of the gates of thetransistors. Indeed, the source/drain regions may be performed at othersteps in the process.

Notably, as mentioned above, gates 124 of the transistors of memorycells 104 and gates 124 of transistors 108 of logic section 106 may beinterconnected in various ways in order to provide a predeterminedcircuit configuration, function or operation. (See, FIGS. 17A-17C). Forexample, in one embodiment, selected or predetermined gates 124 oftransistors 108 may be connected to provide a particular circuit,function or operation. (See, FIG. 17C).

There are many inventions described and illustrated herein. Whilecertain embodiments, features, attributes and advantages of theinventions have been described and illustrated, it should be understoodthat many others, as well as different and/or similar embodiments,features, attributes and advantages of the present inventions, areapparent from the description and illustrations. As such, theembodiments, features, attributes and advantages of the inventionsdescribed and illustrated herein are not exhaustive and it should beunderstood that such other, similar, as well as different, embodiments,features, attributes and advantages of the present inventions are withinthe scope of the present inventions.

For example, SOI wafer 12 may include a top or device layer of, forexample, silicon (as described above), germanium, silicon/germanium, andgallium arsenide or any other semiconductor material, whether now knownor later developed, in which transistors may be formed. All suchmaterials are intended to fall within the scope of the presentinvention.

In addition, SOI wafer 12 may be prepared and/or fabricated using anumber of conventional techniques. For example, SOI wafer 12 may be aSIMOX wafer fabricated using well-known techniques including thosedisclosed, mentioned or referenced in U.S. Pat. Nos. 5,053,627;5,080,730; 5,196,355; 5,288,650; 6,248,642; 6,417,078; 6,423,975; and6,433,342 and U.S. Published Patent Applications 2002/0081824 and2002/0123211, the contents of which are hereby incorporated byreference. Notably, all types, materials and/or fabrication techniquesof or for SOI wafers, whether now known or later developed, are intendedto fall within the scope of the present invention.

The memory cell(s) 104 may also employ the structure, features,attributes, architectures, configurations, materials, techniques andadvantages described and illustrated in the following non-provisionalU.S. patent applications:

(1) application Ser. No. 10/450,238, which was filed by Fazan et al. onJun. 10, 2003 and entitled “Semiconductor Device”;

(2) application Ser. No. 10/487,157, which was filed by Fazan et al. onFeb. 18, 2004 and entitled “Semiconductor Device”;

(3) application Ser. No. 10/829,877, which was filed by Ferrant et al.on Apr. 22, 2004 and entitled “Semiconductor Memory Cell, Array,Architecture and Device, and Method of Operating Same”; and

(4) application Ser. No. 10/840,009, which was filed by Ferrant et al.on May 6, 2004 and entitled “Semiconductor Memory Device and Method ofOperating Same”. For the sake of brevity, such discussion, inconjunction with the inventions described herein, will not be repeatedhere. Rather, the entire contents of these non-provisional U.S. patentapplications, including, for example, the inventions, features,attributes, architectures, configurations, materials, techniques andadvantages described and illustrated therein, are hereby incorporated byreference herein.

Moreover, the memory cells may be arranged, configured and/or controlledusing any of the memory cell arrays, architectures and/orcontrol/operation techniques described and illustrated in theabove-referenced four (4) non-provisional U.S. patent applications. Forthe sake of brevity, those discussions will not be repeated; such memorycell arrays, architectures and/or control/operation techniques areincorporated herein by reference.

The inventions (and embodiments thereof) described and illustratedherein are entirely applicable to N-channel and/or P-channeltransistors. Moreover, while the discussion described and illustratedonly source and drain implants, other implants may also be included. Forexample, implants to modify the operation of memory cells 104, whichaffect, for example, the power consumption of memory cells 104 asdescribed and illustrated in (1) application Ser. No. 10/450,238, whichwas filed on Jun. 10, 2003 and entitled “Semiconductor Device”; (2)application Ser. No. 10/487,157, which was filed on Feb. 18, 2004 andentitled “Semiconductor Device”.

In addition, it should be noted that the sensor described andillustrated in the Semiconductor Memory Device Patent Application (forexample, FIG. 18 of the Semiconductor Memory Device Patent Application)may also be implemented in the present invention. In this regard, thatsensor may be integrated with logic and/or memory cells/transistors, ofthe type described above (for example, the high performance and non-highperformance transistors).

The fabrication techniques and flow described and illustrated herein areexemplary embodiments. It is to be understood that other embodiments maybe employed, including changes and additions of those described andillustrated, without departing from the scope of the present invention.For example, the transistors of the logic and/or memory sections mayinclude “halo” implants and threshold adjust implants to, for example,enhance or optimize the performance of the transistors.

The description and illustrations of the present inventions have beenpresented for the purposes of examples. They are not intended to beexhaustive or to limit the inventions to the precise forms, techniques,materials and/or configurations disclosed. Many modifications andvariations are possible in light of the above teaching. It is intendedthat the scope of the invention not be limited to this detaileddescription but be measured by the claims, which follow.

1. A method of manufacturing an integrated circuit device on an SOIwafer having a semiconductor layer disposed on an insulating layer,wherein the integrated circuit device includes a logic section,including a plurality of transistors, and a memory section, including aplurality of memory cells wherein each memory cell consists essentiallyof one transistor, the method comprising: forming a plurality ofsemiconductor pieces in the semiconductor layer of the SOI waferassociated with the logic section, wherein each piece includes aplurality of surfaces; forming a memory section in the semiconductorlayer of the SOI wafer wherein the memory section includes a majorsurface; depositing a dielectric material on (i) the plurality ofsurfaces of the semiconductor pieces and (ii) the major surface of thememory section; providing a conductive material above the dielectricmaterial; forming a plurality of gates and associated gate dielectricsfrom the conductive material and dielectric material; and providingsource and drain regions in (i) the semiconductor pieces and (ii) themajor surface of the memory section.
 2. The method of claim 1 whereinthe source and drain regions of the transistors in the memory sectionare formed in the major surface of the memory section via ionimplantation.
 3. The method of claim 1 wherein the source and drainregions of the transistors in the logic section are formed in thesemiconductor pieces via ion implantation.
 4. The method of claim 1wherein the width of the gates of each transistor of the plurality oftransistors of the logic section is less than the width of the gate ofeach transistor of each memory cell of the memory section.
 5. A methodof manufacturing an integrated circuit device on an SOI wafer having asemiconductor layer disposed on an insulating layer, wherein theintegrated circuit device includes a logic section, including aplurality of transistors, and a memory section, including a plurality ofmemory cells wherein each memory cell consists essentially of onetransistor, the method comprising: forming a plurality of semiconductorpieces in the semiconductor layer of the SOI wafer associated with thelogic section, wherein each semiconductor piece includes a plurality ofsurfaces; forming a plurality of semiconductor pieces in thesemiconductor layer of the SOI wafer associated with the memory section,wherein each semiconductor piece includes a plurality of surfaces;providing a dielectric material on the plurality of surfaces of thesemiconductor pieces of the SOI wafer associated with the memory andlogic sections; providing a conductive material above the dielectricmaterial; forming a plurality of gates and associated gate dielectricsfrom the conductive material and the dielectric material; and providingsource and drain regions in the semiconductor pieces of the SOI waferassociated with the memory and logic sections.
 6. The method of claim 5wherein the source and drain regions of the transistors in the memorysection are formed in the semiconductor pieces of the SOI waferassociated with the memory section via ion implantation.
 7. The methodof claim 5 wherein the source and drain regions of the transistors inthe logic section are formed in the semiconductor pieces of the SOIwafer associated with the logic section via ion implantation.
 8. Themethod of claim 5 wherein the width of the gates of each transistor ofthe plurality of transistors of the logic section is less than the widthof the gate of each transistor of each memory cell of the memorysection.